Electron discharge device



Dec. 26, 1933. v. l.. RoNcl Er AL 1,941,110

ELECTRON DISCHARGE DEVICE Filed Dec. ll, 1929 V L. HoNc/ ATTUHWEYPatented Dec. 26,v 1933 wenn \ i I: ELECTRON DISCRGE DEVICE; 5 l a'viet'eijnmnetBrooklyn, and-Auen remettra@ New York, N. Y..vassignors toBell TelepllollA s.

Laboratories, Incorporated, New

.a corporation of NewYork I 1 L Application December l11, 19,29l

York, 151-552,

scleimsirol.259%275) l rounds the Yfilament and is supported by a collar.l engaging" the stem. The leading-in' wiresv4 for the filament aresealedjjin the stem and extend outwardly to a baseV carryingfterminalsattached "heavy wires 1'? vveldedfto,V a' collar rv18 clamped v,aroundthe stem`13. Ahelical wire grid 19 issupportedby rods'jZOfrom areentrant stein 21 ^to an extension of lthe'iglass vessel 'andthesefterjminals conduct low voltage ytoy the filament for Y heating itand causing emissionA of electrons to the plate electrode. When thedevice susedas l y Y coaxially withtheftrl'tde 16. The detailed conanoscillation generator or amplier' ofhigh Ypower exceedinglyhighrvoltages'arefapplied to the plate electrode to obtain high'power`output. In order to prevent corona discharge or leakage between the lowpotential iilamentV terminals and the high potential plate terminals,the plate electrode leadingin wires are connected to radial terminalsprojecting from a metallic band fastened to the outside wall-of thevessel near one ,preferably of isolantite, whichl is attached to end.This arrangement overcomes the close spacing of the high potential andlow potentialv terminals so that the insulating base is not destroyedvby destructivev discharges arcing across the various terminals andsubstantiallyincreases lthe insulating paths betweenvrthe filament andplate terminals to insure uniform and eiiicient operation of the deviceover a long period of service.

The various features of this invention will be Vmore readilyunderstood'from the following detailed description with reference to theaccompanying drawing in which y Fig. 1 shows in elevation an electrondischarge device partly brokenvaway to show the interior electrodestructure and illustrating the location of the various terminals for theelectrodes in accordance with this invention;v

Fig. 2 is a perspective View on an enlarged scale of the metallicterminal carrying band for the anode of the device; and

Fig; 3 shows in perspective the mounting of the device on a base and thesupport therefor. Referring particularly to Fig. 1, the electrondischarge device comprises a glass enclosing vessel havingV a largediameter center portion 10 and end 'portions 11 and 12l wires 25 serveto 'form a large surface toimof smaller diameter. A plurality ofconcentric glass walls are disposed within the end portion 12 with theouter edgeof the outer walljoined to thelglass portion 12 to outerwalljoined tothe inner end of the next succeeding wall to form an outwardlyextending stemlA, and the outer "endof the second wall joined toanfendofthe innermost wall to' form formnareentrant stem 13, the other end ofthe 5,0

another rcentrant'stem Y(not shown) terminating '55 in a press portion15. This arrangement provides 4Va. long insulating path 4between thelament and anodeleading-n' wiresv within the device.

' A 'iilamentary cathode Y(not shown) lis supported from the pressportion'l and aA large. surface anodeV 16 is attached to the stem 13 byattheptliergcnd of'the vessel 10 and disposed 'struction of theelectrodes and their assemblyin the Sdevice is fully described ina'co'pending" ap- "plication oi V. L.'Ronci and H. W. Ericsson'er.

Noi413,164 filed December 11,1929.' The .iila- 39 m'ri'leadingin wiresk22 are embedded in' rthe press 15 and extend outwardly through thestern 14V and are attacl'fedv tof 'pintypeitermin'als l23 carried by acup-shaped 'insulating member 24 cemented to the glass portion 11 andcarries a f metallic pin type terminal in which the twisted wires 25 aresoldered. The multiple leading-in press'the high frequency signalcurrent on the control or grid electrode 19.

When the device of the `type disclosed is used as an oscillationgenerator or amplifier of high power, exceedingly high potentials are`applied .to the anode or plate electrode 16 and there'is danger ofcorona leakage or disruptive arc discharge between thehigh potentialanode terminals and the low potential filament terminals.

In ,accordance with this invention leakage between the anode andfilament terminals exterior of the enclosing vessel is prevented byplacing the Aanode and filament terminals a relatively long distanceapart. The anode leading-in wires 28 within the device are connected tothe heavy 'i110 A thimble type insulating plug 26 of iso- 'd ,I antitehaving an annular flange portion 27 is 1, glass vessel having areentrant stem, a filament. ,and a plate electrode supported fromsaidstem, 'abase havingterminals for said' filament atwires 1'7 bymetallic strips 29 welded thereto and are embedded in the stem 13.Flexible lengths of wire 30 are attached to the leading-in wires 28 andbent over the edge of the end portion 12 of the vessel and soldered toradial pin terminals v3l projecting from and carried 'bya collar 32encircling the end portion 12 at I'an appropriate distance from thelament terminals. Asishoiwn in Fig. 2 the collar comprises twosemi-circular slotted metallic bands 32 provided with anges 33 which areclamped togetherby screws;34. Between the collar and the glass portion'12 is a strip of yieldable insulating vmaterial138, such as asbestos.The terminal 'pins 31 are attached to -oset portions of thecollar 32Vintermediate the ilanged ends 33 and the offset portions form cavitiesto allow the wires 30 to enter the termiinals 3l. sulating path betweenthe anode and filament terminals and also provides a relatively 'longair gap therebetweeinthus preventing arcs and other discharges betweenthe terminals whereby uniform and eiiicient operation of the device overa Y long period of service is assured.

y f What is claimed is:

1..An electron discharge device comprising a tached to said stem, and aterminal carrying member embracing said vessel and connected to saidplate electrode.

2. An electron discharge device comprising a glass vessel having areentrant stem, a filament and plate electrode supported from said stem,

Vva base having terminals for said lament at tached to said stem, and aterminal memberhavu i-ng two symmetrical portions clamped about saidvessel and connected to said piate electrode.v

' 3. An electron discharge device comprising an enclosing an electrodesupported Within said vessel, a metal band encompassing said vesradial'terminals extending fromsaid band, and an electrical connection betweensaid electrode and said terminals. Y v

4.. An electron discharge device comprising an l,enclosing vesselhavingan extending portion, a

reentrant stern within said portion, an electrode 'supported fromsaid'stem, a ,plurality of leadingin wires attached to said electrodeand extending This arrangement increases the .innr

another of said electrodes.

Vclamped-to said vessel, terminal pins on said col- .lar,-and anelectrical connection between said electrode and said terminal pins.

6. An electron discharge device comprising a :glass vessel :having anextending end portion, an

outwardly extending stem and a reentrant stern terminating in a pressportion concentrically disposed 4within saidA end portion, an electrodesuprported 'from said press portion, a base member of insulatingmaterial mounted on said extendying-stem, terminal pins on said basemember, and leading-in wires for said electrode embedded insaidpressportion and connectedto said terminal pins.

7. An electron'discharge device comprising a glass vessel, a reentrantstem, an outwardly extending stem, and a press disposed concentricallywith respect tosaid vessel,.a `lament supported from vsaid press, a basehaving Yterminals for said filament attached to said extending stem,iilament leading-in wires-embedded in said press' and connected to saidterminals, an anode within said vessel supported from said reentrantstem, a metallic vband surrounding said vessel remote from Asaidterminals, and a multiple electrical connection -between vsaid anode andsaid band.

' 8. In combination, an electron discharge device comprising a glassvessel having an extending portion at each endareentrant stem within oneportion, an electrode mounted on said stem,

.a metallic band surrounding saidY portion, terla'nenclosing vessel, aplurality of cooperating andV relectrically separate electrodes mountedwithin said vessel, aterminal member extending from each end of saidvessel, electrical connections between -said terminal members and two'of said electrodes, Aa metallic band clamped about said vessely4intermediate said terminal members, and an velectrical connectionbetween said band and ALLENv I. CRAWFORD. VICTOR L. Ronin. c

